Improper Validation of AES-GCM Authentication Tag Length in PKCS#7 Envelope Allows Authentication Bypass_CVE-2026-5500

{
    "lastseen": "",
    "description": "wolfSSL's wc_PKCS7_DecodeAuthEnvelopedData() does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A man-in-the-middle can therefore truncate the mac field from 16 bytes to 1 byte, reducing the tag check from 2\u207b\u00b9\u00b2\u2078 to 2\u207b\u2078.",
    "published": "2026-04-10T03:10:25.671Z",
    "modified": "2026-04-10T13:42:28.091Z",
    "type": "cve",
    "title": "Improper Validation of AES-GCM Authentication Tag Length in PKCS#7 Envelope Allows Authentication Bypass",
    "source": "wolfSSL",
    "references": "https://github.com/wolfSSL/wolfssl/pull/10102",
    "id": "CVE-2026-5500",
    "bulletinFamily": "",
    "cwe": [
        "CWE-20"
    ],
    "cvelist": null,
    "sourceData": "wolfSSL wolfSSL 0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "wolfSSL",
    "version": "0",
    "vendor": "wolfSSL",
    "ai_description": "Authentication bypass vulnerability due to improper validation of AES-GCM authentication tag length in PKCS#7 envelope",
    "ai_severity": "High",
    "ai_vendor": "wolfSSL",
    "ai_product": "wolfSSL",
    "ai_version": "0",
    "ai_score": 8.7
}